Whistler looked out the window into the storm, when something caught his eye in the horizon. Through the limited view of rain, he could make out a shape's silhouette from lightning bouncing around it. It's been a while since he's seen tornadoes, but he sees a darker speck seeming to rise up from the ground.
Excited, he starts whistling loudly for the others' attention, waving them to the window to see what he's seeing...